package com.example.community.controller;

import com.example.community.annotation.LoginRequired;
import com.example.community.entity.User;
import com.example.community.service.UserService;
import com.example.community.utils.CommunityUtil;
import com.example.community.utils.HostHolder;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;


/**
 *
 */
@Controller
@RequestMapping("/user")
public class UserController {

    private static final Logger logger = LoggerFactory.getLogger(UserController.class);

    @Value("${community.path.upload}")
    private String uploadPath;
    @Value("${community.path.domain}")
    private String domain;
    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private UserService userService;

    @Autowired
    private HostHolder hostHolder;

    @LoginRequired
    @RequestMapping(path="/setting", method = RequestMethod.GET)
    public String getSettingPage(){
        return "site/setting";
    }

    @LoginRequired
    @RequestMapping(path = "/upload", method = RequestMethod.POST)
    public String uploadHeader(MultipartFile headerImage, Model model){
        if(headerImage == null){
            model.addAttribute("error", "未选择图片");
            return "/site/setting";
        }
        //需要文件后缀, 文件名因为会重复, 所以我们需要为它重命名
        String fileName = headerImage.getOriginalFilename();
        String suffix = fileName.substring(fileName.lastIndexOf("."));
        if(StringUtils.isBlank(suffix)){
            model.addAttribute("error", "文件格式不正确");
            return "/site/setting";
        }
        //生成随机文件名
        fileName = CommunityUtil.generateUUID() + suffix;
        //确定文件存放的路径, File的操作比较简单
        File dest = new File(uploadPath + "/" + fileName);
        try {
            headerImage.transferTo(dest);
        } catch (IOException e) {
            logger.error("上传文件失败: " + e.getMessage());
            throw new RuntimeException("上传文件失败, 服务器异常", e);
        }
        //更新当前用户头像的路径(web访问路径)
        User user = hostHolder.getUser();
        String headerUrl = domain + contextPath + "/user/header/" + fileName;
        userService.updateHeader(user.getId(), headerUrl);
        return "redirect:/index";
    }
    @RequestMapping(path = "/header/{fileName}", method = RequestMethod.GET)
    public void getHeader(@PathVariable("fileName") String fileName, HttpServletResponse response){
        //返回的为我们往浏览器中写入的流, 就返回void就行了
        //服务器存放的路径为
        fileName = uploadPath + "/" + fileName;
        //文件后缀
        String suffix = fileName.substring(fileName.lastIndexOf("."));
        //响应图片
        response.setContentType("image/" + suffix);
        try (
            OutputStream os = response.getOutputStream();
            FileInputStream fis = new FileInputStream(fileName);
        ){
            byte[] buffer = new byte[1024];
            int b = 0;
            while ((b = fis.read(buffer)) != -1){
                os.write(buffer, 0, b);
            }
        } catch (IOException e) {
            logger.error("读取图像失败: " + e.getMessage());
            e.printStackTrace();
        }


    }
}
